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Chemical Identification
Common Name
Esfenvalerate
中文通用名
S-氰戊菊酯
IUPAC
(S)-α-cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)-3-methylbutyrate
CAS
[S-(R*,R*)]-cyano(3-phenoxyphenyl)methyl 4-chloro-2-(1-methylethyl)benzeneacetate
CAS No.
66230-04-4
Molecular Formula
C25H22ClNO3
Molecular Structure
Category
Activity
Esfenvalerate is a synthetic pyrethroid insecticide which is used on a wide range of pests such as moths, flies, beetles, and other insects. It is used on vegetable crops, tree fruit, and nut crops. It may be mixed with a wide variety of other types of pesticides such as carbamate compounds or organophosphates.
Formulation
DP = Dustable powder
Premix
Imidacloprid+esfenvalerate
Esfenvalerate+abamectin
Endosulfan+esfenvalerate
Malathion+esfenvalerate
Esfenvalerate+phoxim
Esfenvalerate+fenitrothion
Physical Properties
Molecular weight:419.9; Physical form:Colourless crystals; ( tech., yellow-brown viscous liquid or solid at 23 °C). Density:1.26 (4-26 °C); Composition:Tech. is ×98% total isomers and ×75% resolved (S,S)- isomers. Melting point:59.0-60.2 °C; ( tech., 43.3-54 °C); Flash point:256 °C (Pensky-Martens); Vapour pressure:2 ×10-4 mPa (25 °C); Henry constant:4.20 × 10-2 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 6.22 (25 °C); Solubility:In water 0.002 mg/l (25 °C). In xylene, acetone, chloroform, ethyl acetate, dimethylformamide, dimethyl sulfoxide >600, hexane 10-50, methanol 70-100 (all in g/ kg, 25 °C).; Stability:Relatively stable to heat and light. Stable to hydrolysis at < pH 5, 7 and 9 (25 °C).;
Toxicology
Oral:Acute oral LD50 for rats 75-88 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >5000, rabbits >2000 mg/kg. 
Slight skin irritant; mild eye irritant. Not a skin sensitiser. Phytotoxicity:Some injury has been noted on crucifers, cucumbers, aubergines, tomatoes, pears and mandarin oranges.
Environmental Profile
Ecotoxicology: 
Bees: LD50 (contact) 0.017 mg/bee.Birds:Acute oral LD50 for bobwhite quail 381 mg/kg. LC50 (8 d) for bobwhite quail >5620, mallard ducks 5247 ppm.Daphnia: LC50 (48 h) 0.24 mg/l.Fish:Extremely toxic to aquatic animals. LC50 (96 h) for fathead minnows 0.690, bluegill sunfish 0.26, rainbow trout 0.26 g/l. 

Environmental fate: 
Animals:Rapid metabolism and elimination occurs in rats and other animals. Primary metabolism involves hydroxylation of 2'- and 4'- hydroxyl moieties, ester cleavage, hydroxylation and oxidation of the alcohol derivatives, oxidation of the cyano moiety and conjugSoil:In sand (0.38% o.m.), Kd (25 °C) 4.4; in sandy loam ( pH 7.3, 1.1% o.m.), Kd (25 °C) 6.4, DT50 88 d; in silty loam (
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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